中文（繁體）
中文（简体）
English
Primary Maths: Chance and Probability Basics (Paper 1 (basics))
Primary Maths: Chance and Probability Basics (Paper 1 (basics))
This paper drills the basics: count all outcomes, count favourable ones, divide and simplify, and tell impossible from certain.
Direct answers Write down the total outcomes and the favourable outcomes before dividing, so the denominator is never wrong.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: Primary Maths: Chance and Probability Basics |
| Level | P6 |
02 Questions (10 items)
- FoundationA bag holds 3 red balls and 5 blue balls. What is the probability of drawing a red ball?
- FoundationA fair dice is thrown once. What is the probability of getting a 6?
- FoundationA fair coin is tossed once. What is the probability of a head?
- IntermediateA bag holds 2 red, 3 green and 5 yellow balls. What is the probability of drawing a green ball?
- IntermediateA spinner is divided into 4 equal parts and 1 part is red. What is the probability of landing on red?
- IntermediateMing says the sun will rise in the west tomorrow. What is the probability of that?
- ChallengeA fair dice is thrown once. What is the probability of a score less than 7?
- ChallengeA bag holds 20 balls and 6 of them are red. What is the probability of drawing a ball that is not red?
- ChallengeA fair dice is thrown once. What is the probability of an even score?
- Error redoA student says the probability of a red ball from a bag of 3 red and 5 blue is 3/5. What is correct?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 3/8 | There are 3 + 5 = 8 outcomes in total and 3 favourable ones, so the probability is 3/8. |
| 2 | 1/6 | The dice has six equally likely results from 1 to 6 and only one of them is a 6. |
| 3 | 1/2 | There are only two equally likely results, head or tail, so the probability is 1/2. |
| 4 | 3/10 | There are 2 + 3 + 5 = 10 balls in all and 3 of them are green. |
| 5 | 1/4 | The four parts are equal, so the red part gives a probability of 1/4 or 0.25. |
| 6 | 0 | It can never happen, and an impossible event has probability zero. |
| 7 | 1 | Every score from 1 to 6 is less than 7, so the event is certain and the probability is 1. |
| 8 | 7/10 | There are 20 minus 6, that is 14, non-red balls, and 14/20 simplifies to 7/10. |
| 9 | 1/2 | The even scores are 2, 4 and 6, so 3 out of 6 simplifies to 1/2. |
| 10 | 3/8 | The error is using only the blue balls as the denominator; it must be all 8 balls, so the answer is 3/8. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Three steps: count every possible outcome, count the outcomes that fit, then divide and simplify; a probability always lies between zero and one.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.